/Engine/Source/Runtime/Experimental/ChaosVehicles/ChaosVehiclesCore/Public/VehicleUtility.h
Calculate turn radius from three points. Note: this function is quite inaccurate for large radii. Return 0 if there is no answer, i.e. points lie on a line
static float TurnRadiusFromThreePoints ( const FVector & PtA, const FVector & PtB, const FVector & PtC )